Remove implicit conversions from scoped_refptr to T* in base/

base/files/file_path_watcher_mac.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/files/file_path_watcher.h"
 #include "base/files/file_path_watcher_kqueue.h"
 
 #if !defined(OS_IOS)
 #include "base/files/file_path_watcher_fsevents.h"
 #endif
@@ skipping 16 matching lines @@
       impl_ = new FilePathWatcherFSEvents();
 #endif  // OS_IOS
     } else {
       impl_ = new FilePathWatcherKQueue();
     }
     DCHECK(impl_.get());
     return impl_->Watch(path, recursive, callback);
   }
 
   virtual void Cancel() OVERRIDE {
-    if (impl_)
+    if (impl_.get())
       impl_->Cancel();
     set_cancelled();
   }
 
   virtual void CancelOnMessageLoopThread() OVERRIDE {
-    if (impl_)
+    if (impl_.get())
       impl_->Cancel();
     set_cancelled();
   }
 
  protected:
   virtual ~FilePathWatcherImpl() {}
 
   scoped_refptr<PlatformDelegate> impl_;
 };
 
 }  // namespace
 
 FilePathWatcher::FilePathWatcher() {
   impl_ = new FilePathWatcherImpl();
 }
 
 }  // namespace base